diff --git a/README.md b/README.md
index da4fe1d..2cc8bdc 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,17 @@
 # Architektoniczne perełki Lublina
 
+## Master device 
+
+Insert for this device is in directory `API_Master`. This device communicates with PC.
+
+## Slave 
+
+### Slave 1
+
+### Slave 2
+
+### Slave 3
+
+### Slave 4
+
+### Slave 5
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